diff --git a/Dockerfile b/Dockerfile
index acc1a49..44048e9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,7 @@ RUN gcc --version
 RUN apt install -y build-essential
 RUN apt install num-utils
 RUN apt install bc
-RUN apt install software-properties-common
+RUN apt install -y software-properties-common
 RUN add-apt-repository ppa:deadsnakes/ppa
 RUN apt install python3.7
 RUN apt install python3-pip